<?php
/**
 * This plugin provides a facility to periodically run the Zenphoto backup utility. Use it to
 * insure that database backups are done on a regular basis.
 *
 * <b>NOTE:</b> The WEB site must be visited for this plugin to be able to check if it is time
 * to run. Inacative sites may not get backed up as frequently as the interval specifies.
 * Of course, if the site is inactive, there probably is little need to do the backup
 * in the first place.
 *
 * Backups are run under the master administrator authority.
 *
 * @author Stephen Billard (sbillard)
 * @package plugins
 * @subpackage admin
 */

$plugin_is_filter = 2|ADMIN_PLUGIN|THEME_PLUGIN;
$plugin_description = gettext("Periodically backup the Zenphoto database.");
$plugin_author = "Stephen Billard (sbillard)";

$option_interface = 'auto_backup';
if ((getOption('last_backup_run')+getOption('backup_interval')*86400) < time()) {	// register if it is time for a backup
	require_once(dirname(dirname(__FILE__)).'/admin-functions.php');
	zp_register_filter('admin_head','auto_backup::timer_handler');
	zp_register_filter('theme_head','auto_backup::timer_handler');
}

/**
 * Option handler class
 *
 */
class auto_backup {
	/**
	 * class instantiation function
	 *
	 */
	function auto_backup() {
		setOptionDefault('backup_interval', 7);
		setOptionDefault('backups_to_keep', 5);
	}


	/**
	 * Reports the supported options
	 *
	 * @return array
	 */
	function getOptionsSupported() {
		return  array(	gettext('Run interval') => array('key' => 'backup_interval', 'type' => OPTION_TYPE_TEXTBOX,
												'order'=>1,
												'desc' => gettext('The run interval (in days) for auto backup.')),
										gettext('Last backup') => array('key' => 'last_backup_run', 'type' => OPTION_TYPE_CUSTOM,
												'order'=>2,
												'desc' => gettext('Last time Auto Backup ran.')),
										gettext('Backups to keep') => array('key' => 'backups_to_keep', 'type' => OPTION_TYPE_TEXTBOX,
												'order'=>0,
												'desc' => gettext('Auto backup will keep only this many backup sets. Older sets will be removed.'))
		);
	}

	function handleOption($option, $currentValue) {
		echo date('Y-m-d H:i:s', getOption('last_backup_run'));
	}

	/**
	 * Handles the periodic start of the backup/restore utility to backup the database
	 * @param string $discard
	 */
	static function timer_handler($discard) {
		setOption('last_backup_run',time());
		$curdir = getcwd();
		$folder = SERVERPATH . "/" . BACKUPFOLDER;
		if (!is_dir($folder)) {
			mkdir ($folder, FOLDER_MOD);
		}
		chdir($folder);
		$filelist = safe_glob('*'.'.zdb');
		$list = array();
		foreach($filelist as $file) {
			$list[$file] = filemtime($file);
		}
		chdir($curdir);
		asort($list);
		$list = array_flip($list);
		$keep = getOption('backups_to_keep');
		while (count($list) >= $keep) {
			$file = array_shift($list);
			@chmod(SERVERPATH . "/" . BACKUPFOLDER.'/'.$file, 0666);
			unlink(SERVERPATH . "/" . BACKUPFOLDER.'/'.$file);
		}

		cron_starter(	SERVERPATH.'/'.ZENFOLDER.'/'.UTILITIES_FOLDER.'/backup_restore.php',
									array('backup'=>1, 'compress'=>sprintf('%u',getOption('backup_compression')),'XSRFTag'=>'backup')
								);
		return $discard;
	}

}

?>